ESE's works engine tuner

[Kickaha]

Is it a Doxford 58JS3 ?

I think you'd need a bigger chassis to fit one of those in

[Haufen]

Attachment 267902

Needed a longer shroud on the needle jet, a leaner pilot, richer slide (like Wob said) and a needle that was leaner in the parallel part, took a while and I am sure that at the track we will have to refine it some more yet.

And at idle there looks like there is a low part in the inlet tract where a puddle might be forming (like you said there could be). I will have to take the RV cover off and see what can be done about draining it into the RV cavity. I figure if it drains into the RV cavity the RV blade will churn it up and fling it back into the moving air stream in the inlet tract.

Thanks, good to know. Is the off idle throttle response of the engine any different after idling for a longer period of time? I guess with the taper bored carb and the shape of the inlet port, just filling the floor of the port (and carb) is not an option.

[TZ350]

Thanks, good to know. Is the off idle throttle response of the engine any different after idling for a longer period of time?

It loads up if left idling ......

I guess with the taper bored carb and the shape of the inlet port, just filling the floor of the port (and carb) is not an option.

No, but I expect to be able to drain it into the RV cavity.

[TZ350]

So did you alter the timing and note the power falling off?

Kel would back off as soon as he saw the det light so we didn't get any comparative runs.

Maybe it is set over sensitive & you aren't getting det yet.

It could be that alright or we have made some mistake in constructing the Det Ear and if that's the case, the way we put the pickup together might be the problem.

[F5 Dave]

. . .

edit: can't you see the pic?

err, no, can you? Is this an Emperors new clothes sort of thing? In which case I can see it.

Its clearly a Sterling engine with a candle so choosing the right grade of wax is important for long trips. Don't go over 3kph or it might blow out.

[F5 Dave]

Kel would back off as soon as he saw the det light so we don't get any comparative runs.
. . .

Remove it, do some runs with safe timing & tweak it more advance until improvement stops & starts to fall off. You've just calibrated your engine to be detoing slightly, but its standard fare dyno tuning of course & you've done it many times.

Then plug the gauge back in & the det ear.

[Kickaha]

err, no, can you?

Yes it also shows up where Yow Ling quoted me



This isn't as good as the other shot, the other one shows the rear of the engine

[Kickaha]

Ok, see how this works then

[F5 Dave]

Ahh, odd. Disc valve 3 cyl. interesting.

[TZ350]

Remove it, do some runs with safe timing & tweak it more advance until improvement stops & starts to fall off. You've just calibrated your engine to be detoing slightly, but its standard fare dyno tuning of course & you've done it many times. Then plug the gauge back in & the det ear.

Good suggestions, I will give them a try ....

[TZ350]

Some good news, after fitting a 5k Ohm resistor plug cap and changing to a new USB serial converter with its own USB driver I did not suffer any of the freezing problems during the last dyno session that had been a real pain before.

[TZ350]

Found out my inlet manifold went downwards just a bit and the other half upwards just a bit, so at low throttle openings with too weak suction from the engine I had like a little puddle in the inlet manifold.

And yes, like yours, a puddle forms in the inlet tract .....

[Drew]

And yes, like yours, a puddle forms in the inlet tract .....

Is it possible that just happens when you shut it down?

I know fuck all, but if a two stroke isn't firing, the draw through effect stops happening I would think. So the mixture would just stall there wouldn't it?

[TZ350]

Is it possible that just happens when you shut it down?

I had wondered about that, bleading float valve and fuel dribbling into the engine while sitting, that sort of thing, but tonight I checked straight after a brisk dyno session and the puddle was there.

[TZ350]

I found the adjustment on the Knock Sensor to be very sensitive and when I took my time to carefully adjust it according to the instructions and use very small movements it seemed to work OK and gave me some confidence that it was detecting even small det.



Three runs at different throttle settings 100-80-60% and the TPS map adjusted so no det red light was seen.

Then for extra on track safety I set the IgniTec to automatically retard 5 deg if the Knock Sensor detected any detonation.

Not a 100% optimised but should get through the next race day with any luck .....

The carburation seems to be realy good now too.